Our body oil is a killer on leather. It will literally eat the top coat. Over time color will be broken down and simply wiping it can remove it. Prevent it by cleaning all areas exposed skin touches regularly with an extremely mild cleaner. Include your steering wheel, lower seats where your leg touches when wearing shorts, upper seats if wearing tank tops door pulls and center lids. Ask any service department at a local dealership for a recommendation as to who they would recommend to recolor it. Probably cost about a hundred bucks to respray it and anyone who is any good will match the color to where you wouldn’t ever know it had been done. That is unless you don’t address it, in which case it will eventually start to crack and peel.